Mechanical properties and electronic structures of borides in Ni-Co-B alloy system

被引：5
|
作者：
Li L. [1 ,2 ]
Liu P. [1 ,2 ]
Zhou Y. [1 ,2 ]
Duan H. [1 ,2 ]
Long M. [1 ,2 ]
Chen D. [1 ,2 ]
机构：
[1] Laboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing
[2] Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing
来源：
Materials Letters | 2022年 / 309卷
基金：
中国国家自然科学基金;
关键词：
Elastic properties; Electronic structures; Intermetallic alloys and compounds; Ni-Co-B alloys;
D O I：
10.1016/j.matlet.2021.131312
中图分类号：
学科分类号：
摘要：
Ni-Co-B ternary coating was obtained by electrodeposition with an microhardness of 285–360 HV. After heat treatment, the hardness reaches up to 953–1100 HV, and CoB, Co2B, and Ni3B second phases were observed. The mechanical properties and electronic structures of NiCo and borides (NiB, Ni2B, Ni3B, Ni4B3, CoB, Co2B, and Co3B) were then systematically investigated by first-principles calculations. Among them, CoB possesses the highest bulk modulus (294 GPa), shear modulus (143 GPa), Young's modulus (370 GPa), and hardness (12.73 GPa), but the weakest ductility. In addition, the hardness of borides gradually increases with increasing boron content. The electronic structures indicate that B-B and Co/Ni-B covalent bonds play an important role in the mechanical properties of borides. Overall, CoB has the largest elastic modulus and hardness, which is expected to increase the rigidity of Ni-Co-B alloys. © 2021 Elsevier B.V.
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